/*
 * Copyright 2018 NAVER Corp.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.navercorp.pinpoint.profiler.monitor.collector.filedescriptor;


import com.navercorp.pinpoint.profiler.monitor.metric.filedescriptor.FileDescriptorMetric;
import com.navercorp.pinpoint.profiler.monitor.metric.filedescriptor.FileDescriptorMetricSnapshot;
import com.navercorp.pinpoint.thrift.dto.TFileDescriptor;

/**
 * @author Roy Kim
 */
public class DefaultFileDescriptorMetricCollector implements FileDescriptorMetricCollector {

    private final FileDescriptorMetric fileDescriptorMetric;

    public DefaultFileDescriptorMetricCollector(FileDescriptorMetric fileDescriptorMetric) {
        if (fileDescriptorMetric == null) {
            throw new NullPointerException("fileDescriptorMetric must not be null");
        }
        this.fileDescriptorMetric = fileDescriptorMetric;
    }

    @Override
    public TFileDescriptor collect() {
        TFileDescriptor tfileDescriptor = new TFileDescriptor();
        FileDescriptorMetricSnapshot snapshot = fileDescriptorMetric.getSnapshot();
        tfileDescriptor.setOpenFileDescriptorCount(snapshot.getOpenFileDescriptorCount());
        return tfileDescriptor;
    }

    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder("DefaultFileDescriptorMetricCollector{");
        sb.append("fileDescriptorMetric=").append(fileDescriptorMetric);
        sb.append('}');
        return sb.toString();
    }
}
